Knockdown container



p 1933. s. BERGSTEIN 1,926,366

KNOCKDOWN CONTAINER Filed May 1, 1951 3 Sheets-Sheet 1 INVENTOR.

ATTORNEY.

Sept. 12, 1933. s. BERGSTEIN KNOCKDOWN CONTAINER 'Filed May 1, 1931 3Sheets-Sheet 2 INVENTOR.

ATTORNE Y5 Sept. 12, 1933. s. BERGSTEIN KNOCKDOWN CONTAINER Filed May 1,1931 3 Sheets-Sheet 3 ATTORNEYS R O T N E V m IIIIIIIIII I PatentedSept. 12, 1933 UNITED STATES PATENT OFFICE KNOCKDOWN CONTAINER SamuelBergstein, Cincinnati, Ohio Application May 1, 1931.

ZClaims.

and end walls will extend substantially at right angles to the base ormain wall of the container.

In the art there has been considerable development in the provision ofknock-down paper containers of the type referred to in which the sideand end walls are formed with diagonal folds which when the container isin knockdown condition makes each end of the container frusto-triangularin shape. Many users of this type of package prefer that the folds ofthe side and end flaps at the ends of the container will lie flat withthe end wall of the base of the con-' tainer and this results in itsometimes being necessary to make the containers with thefrustotriangular ends and then to refold them so that I the end walltogether with the diagonally folded pairs thereof will extend in and lieflat against the bottom wall of the container.

The manufacture of diagonally folded knockdown containers of the typenoted further requires a difiicult diagonal folding operation which itis one of my objects to avoid.

It is the particular object of my invention to provide a knock-downcontainer which will fold fiat and which will have ends which extend atright-angles to the sides of the infolded sides of the container andwhich also may be readily manufactured on a simple folding machine andwhich will not require any diagonal folding of the ends or corner flaps.

Broadly it is the idea of my invention to provide a container which willrequire a side folding operation, a glue-spot applying operation and anend folding operation.

In my previous reference to the folding of the sides and ends of thecontainer, I use the terms sides and ends arbitrarily to indicateopposed walls because in the case of a square package, the size of thesides and ends will be equal.

Referring to the drawings:

Figure 1 is a plan view of a blank for forming my new knock-downcontainer.

Figure 2 is a plan view of the blank folded in one way in which thecontainer may be formed.

Figure 3 is a plan view of the blank after the final folding operation.

Figure 4 is a perspective view of the type of container which is formedfrom the blank when Serial No. 534,338

the blank is folded in the manner illustrated. Figure 5 is a plan viewof a modified type of blank, having cut and scored comer end flaps.Figure 6 is a plan view of the blank shown in Figure 5 after the endfolding operation.

Figure 7 is a plan view of the blank shown in v Figure 6 after the sidefolding operation.

Figure 8 is a perspective view of the carton shown in Figures 5 to 7after it is set up.

Figure 9 is a plan view of another modified type of blank in which thecorner flaps are cut and scored.

Figure 10 is a plan view of the blank after th sides are folded in.

Figure 11 is a plan view of the container after the sides are folded in.

Figure 12 is a perspective view of the type of container shown inFigures 9 to 11 after it is set In describing the various modificationsin my new type of box, I-will first refer to the modificationshown inFigures 5 to 8 and in Figures 9 to 12 because the modification shown inFigures 1 to 4 are susceptible of folding operations in differentsequences, while the modifications in Figures 5 to 8 and in Figures 9 to12 must be folded in a prearranged manner.

In Figure 5 I have shown a blank having a bottom wall A, side walls Band end walls C. Corner flaps D are articulated to the side walls B, asindicated at iz--a and these flaps have diagonal fold lines a--b formedby the usual scoring operation.

The first operation in forming the container from the blank shown inFigure 5 is to pass the blank through a folding machine which turns overthe end flap C and corner flaps D causing these flaps to lie fiat overthe bottom wall A of the container. With suitable spot-glue applying 95mechanism 1 to apply the glue over a desired area of the inwardly foldedflaps, glue or suitable adhesive is applied to the triangular areasindicated at E--E.

The blank is then usually passed in the direction at right-angles to itsmovement to the endfolding operation and the sides B-B together with theend folded corner flaps D are folded over so as to lie flat against thebottom of the container. With the folding over of the side 105 walls,the glued area E of the corner flaps will adhere to the space indicatedat F-F on the outer side of the infolded end walls.

To open up the container for use all that is necessary is to pull outthe end wall C. The side n walls B will then stand erect and the cornerflaps will fold along their diagonal score lines permitting the end wallC to stand in upright position at right-angles to the bottom wall in aplane and at right-angles to the side walls in another plane.

Referring now to the modification shown in Figures 9 to 12, the bottomwall of the blank is indicated at A the side walls articulated to thebottom wall are indicated at B and the end walls articulated to the endsof the bottom wall are indicated at C The corner flaps D are articulatedto the end walls as indicated at a--a' and the corner flaps are providedwith diagonal fold lines indicated at a-b'.

The first folding operation in this modification is performed when theblank is moved in the direction of its length and in which the sidewalls B together with the corner flaps D are folded over to lie fiatagainst the bottom wall of the blank.

By means of spot-glue applying mechanism, triangular areas of adhesiveare applied to the infolded corner flaps in the space in the areaindicated at E The next folding operation illustrated in Figure 11 is tofold over the end walls C of the blank which will cause the adhesive toadhere to the areas of the outer surfaces of the side walls indicated inFigure 10 at F In opening up this modified type of blank, the end wallsare raised to an upright position which will carry the side walls alsoto upright position and the container will be ready for use.

Referring to Figures 1 to 4, we have shown a blank having a bottom wallA side wall B and end walls C The corner flaps have diagonal folds, 11-1) and are articulated as indicated at a a and a-c to both the side andend wall.

I have indicated the manner of folding this modification of blank in away similar to the folding of the modifica ion shown in Figures 5 and 8although by the application of the adhesive to different areas of thecorner flaps, the same manner of folding shown in Figures 9 and 12 maybe employed in which case a container which when set up, will have theappearance of the container shown in Figure 12 instead of that of thecontainer shown in Figure 8.

Figure 2 shows the blank shown in Figure 1 with the sides C folded inagainst the bottom wall of the blank. Adhesive is then applied to thetriangular areas of the outer surface of the infolded corner flaps asindicated at E The side walls B of the blank are then folded in againstthe bottom wall and the -adhesively coated area E adheres to the outersurface of the end walls indicated at F Opening up the infolded blankillustrated in Figure 3 by pulling out on the ends C the side walls Band the end walls C will stand upright at right-angles to the plane ofthe bottom A and the corner flaps will form a triangular fold exteriorlyof the end walls.

It will be obvious that by applying the sequence of folding operationsillustrated in Figures 9 to 12, a blank similar to that shown in thesefigures may be formed from the blank shown in Figure 1 in which the sidewalls extend along the sides of the container with the corner flapsformed in a diagonal fold outside the ends of the sides.

All of the modifications illustrated may be readily folded in two simplefolding operations, without the necessity of any diagonal folding ofside or end flaps which is a much more simple operation than aspreviously been required and which may be formed on a simple envelopefolding machine without the necessity of diagonal folding mechanism.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A knockdown container comprising a rectangular bottom and four wallsupstanding from the respective edges of the bottom, two opposite wallshaving at their respective ends slits leaving square flaps separate fromand folded across the outer sides of the respective adjacent otherwalls, each flap also being folded inwardly on a line from its innermostto its outermost corner, forming an inner triangular half between itsother half and the adjacent wall, and this inner half being fixed tosaid adjacent wall.

2. A four-walled knock-down container comprising a rectangular sheethaving pairs of slits extending in from opposite edges, leavingrectangular corner flaps and forming two opposite wall members eachbetween and separate from each two corner flaps, with each corner flaphaving one triangular half folded onto the other on a diagonal linebeginning at the outer corner next to the adjacent slit, and each wallmember folded in the same direction on a line joining the inner ends ofthe two adjacent slits, onto the adjacent portions of the sheet, andwith the other two opposite edge portions of the sheet folded in thesame direction on lines joining the inner ends of the respectiveadjacent slits, to form the other two opposite walls of the container,with said infolded triangular portions rigidly secured to the innercorner portions of said first two infolded walls, whereby substantiallyregistering edges of the parts thus secured together form compactsubstantially rigid frictional bearings against said other two wallmembers when the container is set up, without tendency to spring open,whereby the container is held in set-up condition.

SAMUEL BERGSTEIN.

